/*
 * TLS v1.0/v1.1/v1.2 client (RFC 2246, RFC 4346, RFC 5246)
 * Copyright (c) 2006-2011, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "utils/includes.h"

#include "utils/common.h"
#include "crypto/sha1.h"
#include "tls/tls.h"
#include "tls/tlsv1_common.h"
#include "tls/tlsv1_record.h"
#include "tls/tlsv1_client.h"
#include "tls/tlsv1_client_i.h"

#ifdef MEMLEAK_DEBUG
static const char mem_debug_file[] ICACHE_RODATA_ATTR = __FILE__;
#endif

/* TODO:
 * Support for a message fragmented across several records (RFC 2246, 6.2.1)
 */


void tls_alert(struct tlsv1_client* conn, u8 level, u8 description)
{
    conn->alert_level = level;
    conn->alert_description = description;
}


void tlsv1_client_free_dh(struct tlsv1_client* conn)
{
    os_free(conn->dh_p);
    os_free(conn->dh_g);
    os_free(conn->dh_ys);
    conn->dh_p = conn->dh_g = conn->dh_ys = NULL;
}


int tls_derive_pre_master_secret(u8* pre_master_secret)
{
    WPA_PUT_BE16(pre_master_secret, TLS_VERSION);

    if (os_get_random(pre_master_secret + 2,
                      TLS_PRE_MASTER_SECRET_LEN - 2)) {
        return -1;
    }

    return 0;
}


int tls_derive_keys(struct tlsv1_client* conn,
                    const u8* pre_master_secret, size_t pre_master_secret_len)
{
    u8 seed[2 * TLS_RANDOM_LEN];
    u8 key_block[TLS_MAX_KEY_BLOCK_LEN];
    u8* pos;
    size_t key_block_len;

    if (pre_master_secret) {
        wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: pre_master_secret",
                        pre_master_secret, pre_master_secret_len);
        os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
        os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
                  TLS_RANDOM_LEN);

        if (tls_prf(conn->rl.tls_version,
                    pre_master_secret, pre_master_secret_len,
                    "master secret", seed, 2 * TLS_RANDOM_LEN,
                    conn->master_secret, TLS_MASTER_SECRET_LEN)) {
            wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive "
                       "master_secret");
            return -1;
        }

        wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: master_secret",
                        conn->master_secret, TLS_MASTER_SECRET_LEN);
    }

    os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
    os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random, TLS_RANDOM_LEN);
    key_block_len = 2 * (conn->rl.hash_size + conn->rl.key_material_len);

    if (conn->rl.tls_version == TLS_VERSION_1) {
        key_block_len += 2 * conn->rl.iv_size;
    }

    if (tls_prf(conn->rl.tls_version,
                conn->master_secret, TLS_MASTER_SECRET_LEN,
                "key expansion", seed, 2 * TLS_RANDOM_LEN,
                key_block, key_block_len)) {
        wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive key_block");
        return -1;
    }

    wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: key_block",
                    key_block, key_block_len);

    pos = key_block;

    /* client_write_MAC_secret */
    os_memcpy(conn->rl.write_mac_secret, pos, conn->rl.hash_size);
    pos += conn->rl.hash_size;
    /* server_write_MAC_secret */
    os_memcpy(conn->rl.read_mac_secret, pos, conn->rl.hash_size);
    pos += conn->rl.hash_size;

    /* client_write_key */
    os_memcpy(conn->rl.write_key, pos, conn->rl.key_material_len);
    pos += conn->rl.key_material_len;
    /* server_write_key */
    os_memcpy(conn->rl.read_key, pos, conn->rl.key_material_len);
    pos += conn->rl.key_material_len;

    if (conn->rl.tls_version == TLS_VERSION_1) {
        /* client_write_IV */
        os_memcpy(conn->rl.write_iv, pos, conn->rl.iv_size);
        pos += conn->rl.iv_size;
        /* server_write_IV */
        os_memcpy(conn->rl.read_iv, pos, conn->rl.iv_size);
        pos += conn->rl.iv_size;
    } else {
        /*
         * Use IV field to set the mask value for TLS v1.1. A fixed
         * mask of zero is used per the RFC 4346, 6.2.3.2 CBC Block
         * Cipher option 2a.
         */
        os_memset(conn->rl.write_iv, 0, conn->rl.iv_size);
    }

    return 0;
}


/**
 * tlsv1_client_handshake - Process TLS handshake
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @in_data: Input data from TLS peer
 * @in_len: Input data length
 * @out_len: Length of the output buffer.
 * @appl_data: Pointer to application data pointer, or %NULL if dropped
 * @appl_data_len: Pointer to variable that is set to appl_data length
 * @need_more_data: Set to 1 if more data would be needed to complete
 *	processing
 * Returns: Pointer to output data, %NULL on failure
 */
u8* tlsv1_client_handshake(struct tlsv1_client* conn,
                           const u8* in_data, size_t in_len,
                           size_t* out_len, u8** appl_data,
                           size_t* appl_data_len, int* need_more_data)
{
    const u8* pos, *end;
    u8* msg = NULL, *in_msg = NULL, *in_pos, *in_end, alert, ct;
    size_t in_msg_len;
    int no_appl_data;
    int used;

    if (need_more_data) {
        *need_more_data = 0;
    }

    if (conn->state == CLIENT_HELLO) {
        if (in_len) {
            return NULL;
        }

        return tls_send_client_hello(conn, out_len);
    }

    if (conn->partial_input) {
        if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
            wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
                       "memory for pending record");
            tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
                      TLS_ALERT_INTERNAL_ERROR);
            goto failed;
        }

        wpabuf_put_data(conn->partial_input, in_data, in_len);
        in_data = wpabuf_head(conn->partial_input);
        in_len = wpabuf_len(conn->partial_input);
    }

    if (in_data == NULL || in_len == 0) {
        return NULL;
    }

    pos = in_data;
    end = in_data + in_len;
    in_msg = os_malloc(in_len);

    if (in_msg == NULL) {
        return NULL;
    }

    /* Each received packet may include multiple records */
    while (pos < end) {
        in_msg_len = in_len;
        used = tlsv1_record_receive(&conn->rl, pos, end - pos,
                                    in_msg, &in_msg_len, &alert);

        if (used < 0) {
            wpa_printf(MSG_DEBUG, "TLSv1: Processing received "
                       "record failed");
            tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
            goto failed;
        }

        if (used == 0) {
            struct wpabuf* partial;
            wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
            partial = wpabuf_alloc_copy(pos, end - pos);
            wpabuf_free(conn->partial_input);
            conn->partial_input = partial;

            if (conn->partial_input == NULL) {
                wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
                           "allocate memory for pending "
                           "record");
                tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
                          TLS_ALERT_INTERNAL_ERROR);
                goto failed;
            }

            os_free(in_msg);

            if (need_more_data) {
                *need_more_data = 1;
            }

            return NULL;
        }

        ct = pos[0];

        in_pos = in_msg;
        in_end = in_msg + in_msg_len;

        /* Each received record may include multiple messages of the
         * same ContentType. */
        while (in_pos < in_end) {
            in_msg_len = in_end - in_pos;

            if (tlsv1_client_process_handshake(conn, ct, in_pos,
                                               &in_msg_len,
                                               appl_data,
                                               appl_data_len) < 0) {
                goto failed;
            }

            in_pos += in_msg_len;
        }

        pos += used;
    }

    os_free(in_msg);
    in_msg = NULL;

    no_appl_data = appl_data == NULL || *appl_data == NULL;
    msg = tlsv1_client_handshake_write(conn, out_len, no_appl_data);

failed:
    os_free(in_msg);

    if (conn->alert_level) {
        wpabuf_free(conn->partial_input);
        conn->partial_input = NULL;
        conn->state = FAILED;
        os_free(msg);
        msg = tlsv1_client_send_alert(conn, conn->alert_level,
                                      conn->alert_description,
                                      out_len);
    } else if (msg == NULL) {
        msg = (u8*)os_zalloc(1);
        *out_len = 0;
    }

    if (need_more_data == NULL || !(*need_more_data)) {
        wpabuf_free(conn->partial_input);
        conn->partial_input = NULL;
    }

    return msg;
}


/**
 * tlsv1_client_encrypt - Encrypt data into TLS tunnel
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @in_data: Pointer to plaintext data to be encrypted
 * @in_len: Input buffer length
 * @out_data: Pointer to output buffer (encrypted TLS data)
 * @out_len: Maximum out_data length
 * Returns: Number of bytes written to out_data, -1 on failure
 *
 * This function is used after TLS handshake has been completed successfully to
 * send data in the encrypted tunnel.
 */
int tlsv1_client_encrypt(struct tlsv1_client* conn,
                         const u8* in_data, size_t in_len,
                         u8* out_data, size_t out_len)
{
    size_t rlen;

    wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Plaintext AppData",
                    in_data, in_len);

    if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_APPLICATION_DATA,
                          out_data, out_len, in_data, in_len, &rlen) < 0) {
        wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
        tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
                  TLS_ALERT_INTERNAL_ERROR);
        return -1;
    }

    return rlen;
}


/**
 * tlsv1_client_decrypt - Decrypt data from TLS tunnel
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @in_data: Pointer to input buffer (encrypted TLS data)
 * @in_len: Input buffer length
 * @need_more_data: Set to 1 if more data would be needed to complete
 *	processing
 * Returns: Decrypted data or %NULL on failure
 *
 * This function is used after TLS handshake has been completed successfully to
 * receive data from the encrypted tunnel.
 */
struct wpabuf* tlsv1_client_decrypt(struct tlsv1_client* conn,
                                    const u8* in_data, size_t in_len,
                                    int* need_more_data)
{
    const u8* in_end, *pos;
    int used;
    u8 alert, *out_pos, ct;
    size_t olen;
    struct wpabuf* buf = NULL;

    if (need_more_data) {
        *need_more_data = 0;
    }

    if (conn->partial_input) {
        if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
            wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
                       "memory for pending record");
            alert = TLS_ALERT_INTERNAL_ERROR;
            goto fail;
        }

        wpabuf_put_data(conn->partial_input, in_data, in_len);
        in_data = wpabuf_head(conn->partial_input);
        in_len = wpabuf_len(conn->partial_input);
    }

    pos = in_data;
    in_end = in_data + in_len;

    while (pos < in_end) {
        ct = pos[0];

        if (wpabuf_resize(&buf, in_end - pos) < 0) {
            alert = TLS_ALERT_INTERNAL_ERROR;
            goto fail;
        }

        out_pos = wpabuf_put(buf, 0);
        olen = wpabuf_tailroom(buf);
        used = tlsv1_record_receive(&conn->rl, pos, in_end - pos,
                                    out_pos, &olen, &alert);

        if (used < 0) {
            wpa_printf(MSG_DEBUG, "TLSv1: Record layer processing "
                       "failed");
            goto fail;
        }

        if (used == 0) {
            struct wpabuf* partial;
            wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
            partial = wpabuf_alloc_copy(pos, in_end - pos);
            wpabuf_free(conn->partial_input);
            conn->partial_input = partial;

            if (conn->partial_input == NULL) {
                wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
                           "allocate memory for pending "
                           "record");
                alert = TLS_ALERT_INTERNAL_ERROR;
                goto fail;
            }

            if (need_more_data) {
                *need_more_data = 1;
            }

            return buf;
        }

        if (ct == TLS_CONTENT_TYPE_ALERT) {
            if (olen < 2) {
                wpa_printf(MSG_DEBUG, "TLSv1: Alert "
                           "underflow");
                alert = TLS_ALERT_DECODE_ERROR;
                goto fail;
            }

            wpa_printf(MSG_DEBUG, "TLSv1: Received alert %d:%d",
                       out_pos[0], out_pos[1]);

            if (out_pos[0] == TLS_ALERT_LEVEL_WARNING) {
                /* Continue processing */
                pos += used;
                continue;
            }

            alert = out_pos[1];
            goto fail;
        }

        if (ct != TLS_CONTENT_TYPE_APPLICATION_DATA) {
            wpa_printf(MSG_DEBUG, "TLSv1: Unexpected content type "
                       "0x%x when decrypting application data",
                       pos[0]);
            alert = TLS_ALERT_UNEXPECTED_MESSAGE;
            goto fail;
        }

        wpabuf_put(buf, olen);

        pos += used;
    }

    wpabuf_free(conn->partial_input);
    conn->partial_input = NULL;
    return buf;

fail:
    wpabuf_free(buf);
    wpabuf_free(conn->partial_input);
    conn->partial_input = NULL;
    tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
    return NULL;
}


/**
 * tlsv1_client_global_init - Initialize TLSv1 client
 * Returns: 0 on success, -1 on failure
 *
 * This function must be called before using any other TLSv1 client functions.
 */
int tlsv1_client_global_init(void)
{
    return crypto_global_init();
}


/**
 * tlsv1_client_global_deinit - Deinitialize TLSv1 client
 *
 * This function can be used to deinitialize the TLSv1 client that was
 * initialized by calling tlsv1_client_global_init(). No TLSv1 client functions
 * can be called after this before calling tlsv1_client_global_init() again.
 */
void tlsv1_client_global_deinit(void)
{
    crypto_global_deinit();
}


/**
 * tlsv1_client_init - Initialize TLSv1 client connection
 * Returns: Pointer to TLSv1 client connection data or %NULL on failure
 */
struct tlsv1_client* tlsv1_client_init(void)
{
    struct tlsv1_client* conn;
    size_t count;
    u16* suites;

    conn = (struct tlsv1_client*)os_zalloc(sizeof(*conn));

    if (conn == NULL) {
        return NULL;
    }

    conn->state = CLIENT_HELLO;

    if (tls_verify_hash_init(&conn->verify) < 0) {
        wpa_printf(MSG_DEBUG, "TLSv1: Failed to initialize verify "
                   "hash");
        os_free(conn);
        return NULL;
    }

    count = 0;
    suites = conn->cipher_suites;
    suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA256;
    suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
    suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA256;
    suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
    suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
    suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
    suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
    conn->num_cipher_suites = count;

    conn->rl.tls_version = TLS_VERSION;

    return conn;
}


/**
 * tlsv1_client_deinit - Deinitialize TLSv1 client connection
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 */
void tlsv1_client_deinit(struct tlsv1_client* conn)
{
    crypto_public_key_free(conn->server_rsa_key);
    tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
    tlsv1_record_change_write_cipher(&conn->rl);
    tlsv1_record_change_read_cipher(&conn->rl);
    tls_verify_hash_free(&conn->verify);
    os_free(conn->client_hello_ext);
    tlsv1_client_free_dh(conn);
    tlsv1_cred_free(conn->cred);
    wpabuf_free(conn->partial_input);
    os_free(conn);
}


/**
 * tlsv1_client_established - Check whether connection has been established
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * Returns: 1 if connection is established, 0 if not
 */
int tlsv1_client_established(struct tlsv1_client* conn)
{
    return conn->state == ESTABLISHED;
}


/**
 * tlsv1_client_prf - Use TLS-PRF to derive keying material
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @label: Label (e.g., description of the key) for PRF
 * @server_random_first: seed is 0 = client_random|server_random,
 * 1 = server_random|client_random
 * @out: Buffer for output data from TLS-PRF
 * @out_len: Length of the output buffer
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_prf(struct tlsv1_client* conn, const char* label,
                     int server_random_first, u8* out, size_t out_len)
{
    u8 seed[2 * TLS_RANDOM_LEN];

    if (conn->state != ESTABLISHED) {
        return -1;
    }

    if (server_random_first) {
        os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
        os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
                  TLS_RANDOM_LEN);
    } else {
        os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
        os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
                  TLS_RANDOM_LEN);
    }

    return tls_prf(conn->rl.tls_version,
                   conn->master_secret, TLS_MASTER_SECRET_LEN,
                   label, seed, 2 * TLS_RANDOM_LEN, out, out_len);
}


/**
 * tlsv1_client_get_cipher - Get current cipher name
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @buf: Buffer for the cipher name
 * @buflen: buf size
 * Returns: 0 on success, -1 on failure
 *
 * Get the name of the currently used cipher.
 */
int tlsv1_client_get_cipher(struct tlsv1_client* conn, char* buf,
                            size_t buflen)
{
    char* cipher;

    switch (conn->rl.cipher_suite) {
        case TLS_RSA_WITH_RC4_128_MD5:
            cipher = "RC4-MD5";
            break;

        case TLS_RSA_WITH_RC4_128_SHA:
            cipher = "RC4-SHA";
            break;

        case TLS_RSA_WITH_DES_CBC_SHA:
            cipher = "DES-CBC-SHA";
            break;

        case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
            cipher = "DES-CBC3-SHA";
            break;

        case TLS_DH_anon_WITH_AES_128_CBC_SHA256:
            cipher = "ADH-AES-128-SHA256";
            break;

        case TLS_DH_anon_WITH_AES_128_CBC_SHA:
            cipher = "ADH-AES-128-SHA";
            break;

        case TLS_RSA_WITH_AES_256_CBC_SHA:
            cipher = "AES-256-SHA";
            break;

        case TLS_RSA_WITH_AES_256_CBC_SHA256:
            cipher = "AES-256-SHA256";
            break;

        case TLS_RSA_WITH_AES_128_CBC_SHA:
            cipher = "AES-128-SHA";
            break;

        case TLS_RSA_WITH_AES_128_CBC_SHA256:
            cipher = "AES-128-SHA256";
            break;

        default:
            return -1;
    }

    os_memcpy((u8*)buf, (u8*)cipher, buflen);

    return 0;
}


/**
 * tlsv1_client_shutdown - Shutdown TLS connection
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_shutdown(struct tlsv1_client* conn)
{
    conn->state = CLIENT_HELLO;

    if (tls_verify_hash_init(&conn->verify) < 0) {
        wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
                   "hash");
        return -1;
    }

    tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
    tlsv1_record_change_write_cipher(&conn->rl);
    tlsv1_record_change_read_cipher(&conn->rl);

    conn->certificate_requested = 0;
    crypto_public_key_free(conn->server_rsa_key);
    conn->server_rsa_key = NULL;
    conn->session_resumed = 0;

    return 0;
}


/**
 * tlsv1_client_resumed - Was session resumption used
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * Returns: 1 if current session used session resumption, 0 if not
 */
int tlsv1_client_resumed(struct tlsv1_client* conn)
{
    return !!conn->session_resumed;
}


/**
 * tlsv1_client_hello_ext - Set TLS extension for ClientHello
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @ext_type: Extension type
 * @data: Extension payload (%NULL to remove extension)
 * @data_len: Extension payload length
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_hello_ext(struct tlsv1_client* conn, int ext_type,
                           const u8* data, size_t data_len)
{
    u8* pos;

    conn->session_ticket_included = 0;
    os_free(conn->client_hello_ext);
    conn->client_hello_ext = NULL;
    conn->client_hello_ext_len = 0;

    if (data == NULL || data_len == 0) {
        return 0;
    }

    pos = conn->client_hello_ext = os_malloc(6 + data_len);

    if (pos == NULL) {
        return -1;
    }

    WPA_PUT_BE16(pos, 4 + data_len);
    pos += 2;
    WPA_PUT_BE16(pos, ext_type);
    pos += 2;
    WPA_PUT_BE16(pos, data_len);
    pos += 2;
    os_memcpy(pos, data, data_len);
    conn->client_hello_ext_len = 6 + data_len;

    if (ext_type == TLS_EXT_PAC_OPAQUE) {
        conn->session_ticket_included = 1;
        wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket");
    }

    return 0;
}


/**
 * tlsv1_client_get_keys - Get master key and random data from TLS connection
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @keys: Structure of key/random data (filled on success)
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_get_keys(struct tlsv1_client* conn, struct tls_keys* keys)
{
    os_memset(keys, 0, sizeof(*keys));

    if (conn->state == CLIENT_HELLO) {
        return -1;
    }

    keys->client_random = conn->client_random;
    keys->client_random_len = TLS_RANDOM_LEN;

    if (conn->state != SERVER_HELLO) {
        keys->server_random = conn->server_random;
        keys->server_random_len = TLS_RANDOM_LEN;
        keys->master_key = conn->master_secret;
        keys->master_key_len = TLS_MASTER_SECRET_LEN;
    }

    return 0;
}


/**
 * tlsv1_client_get_keyblock_size - Get TLS key_block size
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * Returns: Size of the key_block for the negotiated cipher suite or -1 on
 * failure
 */
int tlsv1_client_get_keyblock_size(struct tlsv1_client* conn)
{
    if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO) {
        return -1;
    }

    return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
                conn->rl.iv_size);
}


/**
 * tlsv1_client_set_cipher_list - Configure acceptable cipher suites
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
 * (TLS_CIPHER_*).
 * Returns: 0 on success, -1 on failure
 */
int tlsv1_client_set_cipher_list(struct tlsv1_client* conn, u8* ciphers)
{
    size_t count;
    u16* suites;

    /* TODO: implement proper configuration of cipher suites */
    if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
        count = 0;
        suites = conn->cipher_suites;
        suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA256;
        suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
        suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA256;
        suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
        suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
        suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
        suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;

        /*
         * Cisco AP (at least 350 and 1200 series) local authentication
         * server does not know how to search cipher suites from the
         * list and seem to require that the last entry in the list is
         * the one that it wants to use. However, TLS specification
         * requires the list to be in the client preference order. As a
         * workaround, add anon-DH AES-128-SHA1 again at the end of the
         * list to allow the Cisco code to find it.
         */
        suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
        conn->num_cipher_suites = count;
    }

    return 0;
}


/**
 * tlsv1_client_set_cred - Set client credentials
 * @conn: TLSv1 client connection data from tlsv1_client_init()
 * @cred: Credentials from tlsv1_cred_alloc()
 * Returns: 0 on success, -1 on failure
 *
 * On success, the client takes ownership of the credentials block and caller
 * must not free it. On failure, caller is responsible for freeing the
 * credential block.
 */
int tlsv1_client_set_cred(struct tlsv1_client* conn,
                          struct tlsv1_credentials* cred)
{
    tlsv1_cred_free(conn->cred);
    conn->cred = cred;
    return 0;
}


void tlsv1_client_set_time_checks(struct tlsv1_client* conn, int enabled)
{
    conn->disable_time_checks = !enabled;
}


void tlsv1_client_set_session_ticket_cb(struct tlsv1_client* conn,
                                        tlsv1_client_session_ticket_cb cb,
                                        void* ctx)
{
    wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback set %p (ctx %p)",
               cb, ctx);
    conn->session_ticket_cb = cb;
    conn->session_ticket_cb_ctx = ctx;
}
